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	<title>Document</title>
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<body>
	<div class="root">
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	<button type="button">深度优先遍历</button>
	<button type="button">广度优先遍历</button>
	<button type="button">深度遍历查找</button>
	<button type="button">广度遍历查找</button>
	<input type="text" id="input"><span id="tip"></span>
	<button type="button" title="点击选中一个节点，在输入框输入内容，点击增加节点">增加节点</button>
	<button type="button" title="选中一个节点，点击删除节点">删除节点</button>

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